66942644 has 12 divisors (see below), whose sum is σ = 117214944. Its totient is φ = 33452664.

The previous prime is 66942641. The next prime is 66942661. The reversal of 66942644 is 44624966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66942641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6239 + ... + 13145.

It is an arithmetic number, because the mean of its divisors is an integer number (9767912).

Almost surely, 2^66942644 is an apocalyptic number.

It is an amenable number.

66942644 is a deficient number, since it is larger than the sum of its proper divisors (50272300).

66942644 is a wasteful number, since it uses less digits than its factorization.

66942644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9334 (or 9332 counting only the distinct ones).

The product of its digits is 248832, while the sum is 41.

The square root of 66942644 is about 8181.8484464087. The cubic root of 66942644 is about 406.0388793686.

The spelling of 66942644 in words is "sixty-six million, nine hundred forty-two thousand, six hundred forty-four".